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<h2><span class="refentrytitle">Class specify_except</span></h2>
<p>boost::contract::specify_except — Allow to specify exception guarantees. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../reference.html#header.boost.contract.core.specify_hpp" title="Header &lt;boost/contract/core/specify.hpp&gt;">boost/contract/core/specify.hpp</a>&gt;

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<span class="keyword">class</span> <a class="link" href="specify_except.html" title="Class specify_except">specify_except</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="specify_except.html#boost.contract.specify_exceptconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="specify_except.html#idm45125848178288-bb"><span class="special">~</span><span class="identifier">specify_except</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="specify_except.html#idm45125848185856-bb">public member functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> F<span class="special">&gt;</span> <a class="link" href="specify_nothing.html" title="Class specify_nothing">specify_nothing</a> <a class="link" href="specify_except.html#idm45125848185296-bb"><span class="identifier">except</span></a><span class="special">(</span><span class="identifier">F</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
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<a name="idm45885985425120"></a><h2>Description</h2>
<p>Allow to specify the functor this library will call to check exception guarantees. This object is internally constructed by the library when users specify contracts calling <code class="computeroutput"><a class="link" href="function.html" title="Function function">boost::contract::function</a></code> and similar functions (that is why this class does not have a public constructor).</p>
<p><span class="bold"><strong>See Also:</strong></span></p>
<p> <a class="link" href="../../boost_contract/tutorial.html#boost_contract.tutorial.exception_guarantees" title="Exception Guarantees"> Exception Guarantees</a> </p>
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<a name="idm45885985420784"></a><h3>
<a name="boost.contract.specify_exceptconstruct-copy-destruct"></a><code class="computeroutput">specify_except</code> 
        public
       construct/copy/destruct</h3>
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<pre class="literallayout"><a name="idm45125848178288-bb"></a><span class="special">~</span><span class="identifier">specify_except</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Destruct this object. <p><span class="bold"><strong>Throws:</strong></span> This is declared <code class="computeroutput">noexcept(false)</code> since C++11 to allow users to program failure handlers that throw exceptions on contract assertion failures (not the default, see  <a class="link" href="../../boost_contract/advanced.html#boost_contract.advanced.throw_on_failures__and__noexcept__" title="Throw on Failures (and noexcept)">
            Throw on Failure</a>). </p>
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<a name="idm45885985411616"></a><h3>
<a name="idm45125848185856-bb"></a><code class="computeroutput">specify_except</code> public member functions</h3>
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<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> F<span class="special">&gt;</span> <a class="link" href="specify_nothing.html" title="Class specify_nothing">specify_nothing</a> <a name="idm45125848185296-bb"></a><span class="identifier">except</span><span class="special">(</span><span class="identifier">F</span> <span class="keyword">const</span> <span class="special">&amp;</span> f<span class="special">)</span><span class="special">;</span></pre>Allow to specify exception guarantees. <p>

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<td><p><span class="term">Parameters:</span></p></td>
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<td><p><span class="term"><code class="computeroutput">f</code></span></p></td>
<td><p>Nullary functor called by this library to check exception guarantees <code class="computeroutput">f()</code>. Assertions within this functor are usually programmed using  <code class="computeroutput"><code class="computeroutput"><a class="link" href="../../BOOST_CONTRACT_ASSERT.html" title="Macro BOOST_CONTRACT_ASSERT">BOOST_CONTRACT_ASSERT</a></code></code>, but any exception thrown by a call to this functor indicates a contract assertion failure (and will result in this library calling  <code class="computeroutput"><code class="computeroutput"><a class="link" href="except_failure.html" title="Function except_failure">boost::contract::except_failure</a></code></code>). This functor should capture variables by (constant) references (to access the values they will have at function exit).</p></td>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>After exception guarantees have been specified, the object returned by this function does not allow to specify any additional contract. </p></td>
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<td align="right"><div class="copyright-footer">Copyright © 2008-2019 Lorenzo Caminiti<p>
        Distributed under the Boost Software License, Version 1.0 (see accompanying
        file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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